Method and apparatus for uplink transmission

ABSTRACT

Disclosed are a method and an apparatus for uplink transmission. A method for uplink transmission for a machine-type communication (MTC) terminal comprises: a step of transmitting first uplink (UL) information via a first UL channel in a first terminal-specific frequency band of a first subframe; and a step of transmitting second UL information via a second UL channel in a second terminal-specific frequency band of a second subframe subsequent to the first subframe. The first subframe and the second subframe each include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. If the first terminal-specific frequency band and the second terminal-specific frequency band do not overlap one another, the second UL information may not be transmitted in a first OFDM symbol of the second subframe. Thus, a wireless resource can be efficiently utilized.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the National Stage filing under 35 U.S.C. 371 ofInternational Application No. PCT/KR2013/002193, filed on Mar. 18, 2013,which claims the benefit of U.S. Provisional Application Ser. No.61/612,205, filed on Mar. 16, 2012, the contents of which are all herebyincorporated by reference herein in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns wireless communications, and morespecifically, to an uplink transmission method.

2. Related Art

M2M (machine to machine)/IoT (Internet of Things) recently gainsattention, as a main issue, in the next-generation communication marketfor connecting all the ambient things to each other via a network toprovide for easy acquisition and delivery of necessary informationanytime and anywhere and to resultantly provide for various services.The initial type of M2M primarily focused on sensors and RFID (RadioFrequency Identification) networks targeting local areas. However, moreattention is nowadays oriented towards the mobile communicationnetwork-based M2M considering mobility of things, a wide service rangeincluding islands or mountainous areas or marine areas, easy operationor maintenance of networks, security for high-reliability datatransmission, and guarantee of service quality.

The 3GPP, a representative European mobile communication standardizationorganization, since having studied feasibility on M2M on 2005, startedstandardization under the title “Machine Type Communications (MTC)” from2008.

In view of the 3GPP, the term “machine” refers to an entity that doesnot require direct manipulation or involvement of human beings, and theterm “MTC” is defined as a type of data communication including one ormore of such type of machines.

As a typical example of the machine, a smart meter or vending machineequipped with a mobile communication module is referenced. As thesmartphone appears that may automatically gain access to a network toconduct communication even without the user's manipulation orinvolvement depending on the user's position or condition, the portableterminals with the MTC function are also taken into account as a type ofthe machine. Further, a gateway-type MTC device connected with IEEE802.15 WPAN (Wireless Personal Area Network)-based microsensors or RFIDsare also being considered as an MTC device.

To encompass a great number of MTC devices communicating a small amountof data, the mobile communication network requires an identifier andaddress system different from the conventional ones and may need a newmechanism considering communication schemes and costs.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an uplink transmissionmethod.

Another object of the present invention is to provide a device thatperforms an uplink transmission method.

To achieve the above objects of the present invention, according to anaspect of the present invention, an uplink transmission method for anMTC (Machine Type Communication) terminal may comprise transmittingfirst UL (uplink) information on a first UL channel in a firstterminal-specific frequency band of a first OFDM (Orthogonal FrequencyDivision Multiplexing) symbol; and transmitting second UL information ona second UL channel in a second terminal-specific frequency band of asecond OFDM symbol, wherein at least one OFDM symbol may be arrangedbetween the first OFDM symbol and the second OFDM symbol, and whereinwhen the first terminal-specific frequency band may not be consistentwith the second terminal-specific frequency band or when the firstterminal-specific frequency band does not include the secondterminal-specific frequency band, UL transmission may not be performedin the at least one OFDM symbol between the first OFDM symbol and thesecond OFDM symbol. The first OFDM symbol may be a last OFDM symbol of afirst subframe, and the second OFDM symbol may be a second OFDM symbolof a second subframe contiguous to the first subframe, wherein abandwidth supported by the MTC terminal may be smaller than an overallbandwidth of the first subframe and the second subframe, wherein thesize of the first terminal-specific frequency band and the secondterminal-specific frequency band may be equal to or smaller than thebandwidth supported by the MTC terminal, and wherein the overallbandwidth may be 20 MHz or more, and the bandwidth supported by the MTCterminal may be 0.5 MH or more and 2 MHz or less. The first OFDM symbolmay be a last OFDM symbol of a first subframe, and the second OFDMsymbol may be a second OFDM symbol of a second subframe contiguous tothe first subframe, and the method further may comprise transmitting anSRS (Sounding Reference Signal) in a third terminal-specific frequencyband of one OFDM symbol among a plurality of OFDM symbols in the firstsubframe. The UL transmission may not be performed in an OFDM symbolsubsequent to the OFDM symbol where the SRS may be transmitted. Thefirst UL channel may include at least one of a first PUCCH (physicaluplink control channel) and a first PUSCH (physical uplink sharedchannel), and the second UL channel may include at least one of a secondPUCCH and a second PUSCH. The uplink transmission method may furthercomprise receiving terminal-specific frequency band determinationinformation from a base station, wherein the terminal-specific frequencyband determination information may include information on the firstterminal-specific frequency band and the second terminal-specificfrequency band. The terminal-specific frequency band determinationinformation may include information on a frequency pattern in which afrequency band changes from the first terminal-specific frequency bandto the second terminal-specific frequency band.

To achieve the above objects of the present invention, according to anaspect of the present invention, an MTC (Machine Type Communication)terminal, the MTC terminal comprising a processor, the processorconfigured to transmit first UL (uplink) information on a first ULchannel in a first terminal-specific frequency band of a first OFDM(Orthogonal Frequency Division Multiplexing) symbol; and transmit secondUL information on a second UL channel in a second terminal-specificfrequency band of a second OFDM symbol, wherein at least one OFDM symbolmay be arranged between the first OFDM symbol and the second OFDMsymbol, and wherein when the first terminal-specific frequency band maynot be consistent with the second terminal-specific frequency band orwhen the first terminal-specific frequency band does not include thesecond terminal-specific frequency band, UL transmission may not beperformed in the at least one OFDM symbol between the first OFDM symboland the second OFDM symbol. The first OFDM symbol may be a last OFDMsymbol of a first subframe, and the second OFDM symbol may be a secondOFDM symbol of a second subframe contiguous to the first subframe,wherein a bandwidth supported by the MTC terminal may be smaller than anoverall bandwidth of the first subframe and the second subframe, whereinthe size of the first terminal-specific frequency band and the secondterminal-specific frequency band may be equal to or smaller than thebandwidth supported by the MTC terminal, and wherein the overallbandwidth may be 20 MHz or more, and the bandwidth supported by the MTCterminal may be 0.5 MH or more and 2 MHz or less. The processor may beconfigured to transmit an SRS (Sounding Reference Signal) in a thirdterminal-specific frequency band of one OFDM symbol among a plurality ofOFDM symbols in the first subframe, and wherein the first OFDM symbolmay be a last OFDM symbol of a first subframe, and the second OFDMsymbol may be a second OFDM symbol of a second subframe contiguous tothe first subframe. The processor may be configured to prevent the ULtransmission from being performed in an OFDM symbol subsequent to theOFDM symbol where the SRS may be transmitted. The first UL channel mayinclude at least one of a first PUCCH (physical uplink control channel)and a first PUSCH (physical uplink shared channel), and the second ULchannel may include at least one of a second PUCCH and a second PUSCH.The processor may be configured to receive terminal-specific frequencyband determination information from a base station, wherein theterminal-specific frequency band determination information may includeinformation on the first terminal-specific frequency band and the secondterminal-specific frequency band. The terminal-specific frequency banddetermination information may include information on a frequency patternin which a frequency band changes from the first terminal-specificfrequency band to the second terminal-specific frequency band.

Radio resources may be efficiently utilized.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the structure of a radio frame in 3GPP (3^(rd) GenerationPartnership Project) LTE (Long Term Evolution).

FIG. 2 shows an example resource grid for a downlink slot.

FIG. 3 shows the structure of a downlink subframe.

FIG. 4 shows the structure of an uplink subframe.

FIG. 5 is a concept view illustrating the transmission bandwidth of anuplink channel according to an embodiment of the present invention.

FIGS. 6 and 7 are concept views illustrating a method for assigning aterminal-specific PUSCH in a terminal-specific frequency band accordingto an embodiment of the present invention.

FIG. 8 is a concept view illustrating an RB (resource block) to which aterminal-specific PUCCH is assigned according to an embodiment of thepresent invention.

FIGS. 9 and 10 are concept views illustrating a method for assigning aterminal-specific PUSCH and a terminal-specific PUCCH according to anembodiment of the present invention.

FIG. 11 is a concept view illustrating a method for transmitting aterminal-specific SRS according to an embodiment of the presentinvention.

FIG. 12 shows an example where the position of the OFDM symbol where theSRS is transmitted in the terminal-specific frequency band is changedaccording to an embodiment of the present invention.

FIGS. 13 and 14 are concept views illustrating a method for sending aPUSCH and an SRS in one subframe according to an embodiment of thepresent invention.

FIGS. 15 and 16 are concept views illustrating a method for assigning anSRS and a terminal-specific PUSCH in a plurality of subframes accordingto an embodiment of the present invention.

FIG. 17 is a concept view illustrating a method for contiguouslyallocating terminal-specific PUSCHs in a plurality of subframesaccording to an embodiment of the present invention.

FIG. 18 is a concept view illustrating a method for contiguouslyallocating terminal-specific PUCCHs and terminal-specific PUSCHsaccording to an embodiment of the present invention.

FIG. 19 is a concept view illustrating a method for allocating an SRSand a terminal-specific PUCCH according to an embodiment of the presentinvention.

FIG. 20 is a block diagram illustrating a wireless communication systemaccording to an embodiment of the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

The wireless device may be stationary or mobile and may also be referredto as UE (User Equipment), MS (mobile station), MT (mobile terminal), UT(user terminal), SS (subscriber station), PDA (personal digitalassistant), wireless modem, handheld device, etc. The wireless devicemay be a device that supports only data communication such as MTC(Machine-Type Communication) devices.

The base station (BS) refers to a fixed station that typicallycommunicates with a wireless device and may be referred to as eNB(evolved-NodeB), BTS (Base Transceiver System), access point, etc.

Hereinafter, application of the present invention based on 3GPP (3^(rd)Generation Partnership Project) TS (Technical Specification) release8-based 3GPP LTE (Long Term Evolution) or 3GPP TS release 10-based 3GPPLTE-A is described. This is merely an example, and the present inventionmay be applicable to various wireless communication networks.Hereinafter, LTE includes LTE and/or LTE-A.

FIG. 1 shows the structure of a radio frame in 3GPP (3^(rd) GenerationPartnership Project) LTE (Long Term Evolution).

For the structure of the radio frame 100 in 3GPP LTE, 3GPP (3rdGeneration Partnership Project) TS 36.211 V8.2.0 (2008-03) “TechnicalSpecification Group Radio Access Network; Evolved Universal TerrestrialRadio Access (E-UTRA); Physical channels and modulation (Release 8),”Ch. 5 may be referenced. Referring to FIG. 1, the radio frame 100includes 10 subframes 120, and one subframe 120 includes two slots 140.The radio frame 100 may be indexed along the slots 140 from slot #0 toslot #19 or may be indexed along the subframes 120 from subframe #0 tosubframe #9. Subframe #0 may include slot #0 and slot #1.

The time taken for one subframe 120 to be transmitted is denoted TTI(Transmission Time Interval). The TTI may be a scheduling unit for datatransmission. For example, the length of one radio frame 100 may be 10ms, the length of one subframe 120 may be 1 ms, and the length of oneslot 140 may be 0.5 ms.

One slot 140 includes a plurality of OFDM (Orthogonal Frequency DivisionMultiplexing) symbols in the time domain and a plurality of sub-carriersin the frequency domain. The OFDM symbol is for representing one symbolperiod in view that 3GPP LTE adopts OFDMA for downlink and may bedenoted with other terms according to multiple access schemes. Forexample, in case SC-FDMA (Single Carrier-Frequency Division MultipleAccess) as uplink multiple access scheme, the symbol may be denotedSC-FDMA symbol. A resource block (RB) is the unit for resourceallocation, and includes a plurality of contiguous sub-carriers in oneslot. The resource block will be described below in detail in connectionwith FIG. 2. The structure of the radio frame 100 shown in FIG. 1 ismerely an example. Accordingly, the number of subframes 120 included inthe radio frame 100, the number of slots 140 included in the subframe120, or the number of OFDM symbols included in the slot 140 may varywidely, so that new formats of the radio frame may be defined.

According to the 3GPP LTE standards, in case normal cyclic prefix (CP)is used, one slot includes seven OFDM symbols, and in case extended CPis used, one slot includes six OFDM symbols.

Wireless communication systems may be generally classified into onesusing the FDD (Frequency Division Duplex) scheme and ones using the TDD(Time Division Duplex) scheme. According to the FDD scheme, uplinktransmission and downlink transmission, respectively, are performed indifferent frequency bands from each other. According to the TDD scheme,uplink transmission and downlink transmission are performed in differenttimes, respectively, while occupying the same frequency band. The TDDscheme-based channel responses are conducted substantially reciprocally.This means that in a given frequency band a downlink channel response issubstantially the same as an uplink channel response. Accordingly, theTDD-based wireless communication system has the benefit that a downlinkchannel response may be obtained from an uplink channel response. Sincein the TDD scheme the overall frequency band is time-divided for uplinktransmission and downlink transmission, the downlink transmission by thebase station cannot be performed simultaneously with the uplinktransmission by the terminal. In the TDD system where uplinktransmission is distinguished from downlink transmission per subframe,the uplink transmission and the downlink transmission are conducted indifferent subframes from each other.

FIG. 2 shows an example resource grid for a downlink slot.

The downlink slot includes a plurality of OFDM symbols in the timedomain and includes N_(RB) resource blocks in the frequency domain.N_(RB), the number of resource blocks included in the downlink slot,depends on the downlink transmission bandwidth set in the cell. Forexample, in the LTE system, N_(RB) may be any one between 6 and 110depending on the transmission bandwidth used. One resource block 200includes a plurality of sub-carriers in the frequency domain. Thestructure of the uplink slot may be the same as the structure of thedownlink slot.

Each element in the resource grid is referred to as resource element220. The resource element 220 in the resource grid may be identified byan index pair k and l in the slot. Here, k (k=0, . . . , N_(RB)×12−1) isa sub-carrier index in the frequency domain, and l (l=0, . . . , 6) isan OFDM symbol index in the time domain.

Although the example in which one resource block 200 includes 7×12resource elements 220 having seven OFDM symbols in the time domain andtwelve sub-carriers in the frequency domain is described, the number ofOFDM symbols and sub-carriers in the resource block 200 are not limitedthereto. The number of OFDM symbols and the number of sub-carriers mayvary widely depending on the length of CP or frequency spacing. Forexample, in the case of normal CP, the number of OFDM symbols is seven,and in the case of extended CP, the number of OFDM symbols is six. Thenumber of sub-carriers in one OFDM symbol may be one of 128, 256, 512,1024, 1536 and 2048.

FIG. 3 shows the structure of a downlink subframe.

The downlink subframe 400 includes two slots 310 and 320 in the timedomain, and each slot 310 or 320 includes seven OFDM symbols in thenormal CP. The first up to three OFDM symbols (up to 4 OFDM symbols forthe 1.4 Mhz bandwidth) in the first slot 310 of the subframe 300 becomea control region 350 where control channels are assigned, and theremaining OFDM symbols become a data region 360 where a PDSCH (PhysicalDownlink Shared Channel) is assigned.

The PDCCH may carry resource allocation of DL-SCH (downlink-sharedchannel) and transmission format, resource allocation information ofUL-SCH, paging information on PCH, system information on DL-SCH,resource allocation of upper layer control message such as random accessresponse transmitted on PDSCH, a set of transmission power controlcommands on individual UEs in any UE group, and activation informationof VoIP (Voice over internet Protocol). A plurality of PDCCH regions maybe defined in the control region 350, and the terminal may monitor aplurality of PDCCHs. A PDCCH is transmitted on one or the aggregation ofa few contiguous CCEs (Control Channel Elements). The CCE is the logicalallocation unit used to provide the PDCCH with a coding rate dependingon the condition of a radio channel. The CCE corresponds to a pluralityof resource element groups. Depending on the correlation between thenumber of CCEs and coding rate provided by the CCEs, the format of PDCCHand the possible number of PDCCH bits are determined.

The base station determine a PDCCH format depending on DCI (DownlinkControl information) to be sent to the terminal and adds a CRC (CyclicRedundancy Check) to the control information. The CRC is masked with aunique identifier (RNTI; radio network temporary identifier) dependingon the owner or purpose of the PDCCH. In the case of a PDCCH for aparticular terminal, the CRC might be masked with the terminal's uniqueidentifier, e.g., C-RNTI (cell-RNTI). Or, in the case of a PDCCH for apaging message, the CRC might be masked with a paging indicationidentifier, e.g., P-RNTI (paging-RNTI). In the case of a PDCCH for asystem information block (SIB), the CRC might be masked with a systeminformation identifier, SI-RNTI (system information-RNTI). In order toindicate a random access response that is responsive to the terminalsending a random access preamble, an RA-RNTI (random access-RNTI) may bemasked to the CRC.

FIG. 4 shows the structure of an uplink subframe.

The uplink subframe may be divided into control regions 430 and 440 anda data region 450 in the frequency domain. The control regions 430 and440 are assigned with a PUCCH (physical uplink control channel) fortransmission of uplink control information. The data region 450 isassigned with a PUSCH (physical uplink shared channel) for transmissionof data. When instructed by an upper layer, the terminal may support thesimultaneous transmission of the PUSCH and the PUCCH.

A PUCCH for one terminal is assigned in a resource block (RB) pair inthe subframe 400. The resource blocks in the resource block pair occupydifferent sub-carriers from each other in each of the first slot 410 andthe second slot 420. The frequencies occupied by the resource blocks inthe resource block pair assigned to the PUCCH change with respect to aslot boundary. This is referred to as the RB pair assigned to the PUCCHbeing frequency-hopped at the slot boundary. The terminal may obtain afrequency diversity gain by sending uplink control information throughdifferent sub-carriers from each other depending on times. m is apositional index indicating the logical frequency-domain position of theresource block pair assigned to the PUCCH in the subframe.

Uplink control information transmitted on PUCCH includes HARQ (hybridautomatic repeat request) ACK (acknowledgement)/NACK(non-acknowledgement), CQI (channel quality indicator) indicating thedownlink channel state, and SR (scheduling request) that is a requestfor uplink radio resource allocation.

The PUSCH is mapped to the UL-SCH (uplink shared channel) that is atransport channel. Uplink data transmitted over PUSCH may be a transportblock that is a data block for UL-SCH transmitted during a TTI. Thetransport block may be user information. Or, the uplink data may bemultiplexed data. The multiplexed data may be the data obtained bymultiplexing the transport block for UL-SCH and control information. Forexample, the control information multiplexed with data may include CQI,PMI (precoding matrix indicator), HARQ, and RI (rank indicator). Or, theuplink data may consist of control information only.

According to an embodiment of the present invention, a method fortransmitting data through an uplink channel using only a portion of thefrequency bandwidth of the uplink channel is described below.

FIG. 5 is a concept view illustrating the transmission bandwidth of anuplink channel according to an embodiment of the present invention.

Referring to FIG. 5, the overall frequency bandwidth of the uplinkchannel is 20 MHz. The terminal may use a portion (e.g., 1.08 MHz) ofthe overall frequency band as its operation frequency band. Thefrequency band in which the terminal operates is defined as aterminal-specific frequency band 500. The terminal-specific frequencyband 500, 1.08 MHz, is merely an example, and other various frequencybands may be used as the terminal-specific frequency band 500 (forexample, 0.5 MHz-2 MHz). Further, the overall uplink bandwidth mayinclude a plurality of terminal-specific frequency bands 500. Theterminal may send data using only a portion of the terminal-specificfrequency band 500.

Such terminal-specific frequency band 500 may be used as the uplinkfrequency bandwidth of a terminal periodically or aperiodically sendinga small amount of data, such as MTC (machine type communication) UE(user equipment). The MTC terminal does not require a wide frequencybandwidth to transmit data through the uplink channel. Accordingly, theMTC terminal receives from the base station allocation informationregarding the terminal-specific frequency band 500. The MTC terminal maysend PUCCH (physical uplink control channel) data and PUSCH (physicaluplink shared channel) data through the terminal-specific frequency band500. The term “terminal” as used hereinafter may denote an MTC terminal.

The overall uplink frequency band may include a plurality ofterminal-specific frequency bands 500 as subbands. The terminal may sendPUCCH data and PUSCH data to the base station through one of theplurality of subbands. The phrase “the terminal-specific frequency band(or subband) used for the terminal to send data changes” denotes whenthe subband before change is not consistent with the subband afterchange or when the subband before change does not fully encompass thesubband after change.

As used hereinafter, the “subband” may be used to have the same meaningas the terminal-specific frequency band 500. Some of the frequencyresources in the terminal-specific frequency band 500 may be assigned asa terminal-specific PUCCH (520) resource for transmittingterminal-specific PUCCH data, and others may be assigned as aterminal-specific PUSCH 540 resource for transmitting terminal-specificPUSCH data.

A method for allocating a terminal-specific PUCCH 540, aterminal-specific PUSCH 520, and a reference signal in an uplinkfrequency bandwidth is described below according to an embodiment of thepresent invention.

FIGS. 6 and 7 are concept views illustrating a method for assigning aterminal-specific PUSCH in a terminal-specific frequency band accordingto an embodiment of the present invention.

The base station may assign the terminal-specific PUSCH in various ways.Hereinafter, a method for assigning a terminal-specific PUSCH isdescribed with reference to FIGS. 6(A) and (B) and FIGS. 7(A) and (B).

FIG. 6(A) illustrates a method for transmitting data through aterminal-specific PUSCH using resource allocation informationtransmitted from the base station.

Referring to FIG. 6(A), the base station may send information on afrequency band assigned to the terminal-specific PUSCH 600 using upperlayer signaling (for example, RRC (radio resource control) signaling) ordownlink control information (DCI). As described above, the overalluplink frequency band may include at least one terminal-specificfrequency band, and the terminal-specific frequency band may include aterminal-specific PUSCH 600 and a terminal-specific PUCCH.

The control information transmitted at an upper layer such as RRC layermay contain information instructing a specific frequency band as theterminal-specific PUSCH 600. The terminal may receive information on thefrequency band to which the terminal-specific PUSCH 600 is assigned,based on RRC signaling. The terminal may send the terminal-specificPUSCH information through the frequency band of the obtainedterminal-specific PUSCH 600.

FIG. 6(B) illustrates a method for allocating an uplink sync PUSCH to apredetermined frequency band.

Referring to FIG. 6(B), the frequency band available as theterminal-specific PUSCH 650 in the entire uplink frequency band may befixed as a predetermined one. In such case, even without receiving theinformation for allocating the terminal-specific PUSCH 650 from the basestation, the terminal may use the predetermined frequency band as theterminal-specific PUSCH 650.

FIG. 7(A) illustrates a method for allocating a terminal-specific PUSCHaccording to a predetermined frequency hopping pattern.

Referring to FIG. 7(A), the frequency hopping pattern may be preset inwhich a frequency band assigned with a terminal-specific PUSCH ishopped. The terminal-specific PUSCH may be changed for its assignedfrequency bandwidth in predetermined units, such as, e.g., per subframe,according to the preset frequency hopping pattern.

For example, the uplink frequency bandwidth may include N subbands thatmay be used as the terminal-specific frequency band. In such case, aplurality of terminal-specific frequency bands may be indexed and may bethen used as frequency hopping information. For example, the frequencyband assigned with N terminal-specific PUSCHs may be indexed from 0 toN−1. The indexing information may be used to indicate the frequency bandassigned with a certain terminal-specific PUSCH.

Based on the indexes on the frequency band assigned with theterminal-specific PUSCH, the frequency hopping pattern may be set as,e.g., {0, 2, 4, 0, 2, 4, 0, 2, 4, 1}. In such case, theterminal-specific PUSCH may be assigned according to the sequentialfrequency hopping pattern in such a manner that for the first subframethe terminal-specific frequency band of index 0 is assigned to theterminal-specific PUSCH 700, for the second subframe, theterminal-specific frequency band of index 2 is assigned to theterminal-specific PUSCH 720, and for the third subframe theterminal-specific frequency band of index 4 is assigned to theterminal-specific PUSCH 740.

Different frequency hopping patterns from each other according to cellsmay be defined and used to assign the terminal-specific PUSCH (cellspecific frequency hopping pattern), or different frequency hoppingpatterns from each other may be defined and used according to terminals(UE specific frequency hopping pattern). In other words, there may beprovided a frequency hopping pattern in which differentterminal-specific PUSCHs are assigned according to cells or terminals.

FIG. 7(B) illustrates a method for assigning a terminal-specific PUSCHusing resource allocation information transmitted from a base station.

Referring to FIG. 7(B), the PDCCH (physical downlink control channel)data transmitted from the base station through a downlink channel mayinclude uplink resource allocation information.

Further, the PDCCH data may contain frequency band allocationinformation regarding allocation of the terminal-specific PUSCH. Theterminal-specific PUSCH data may be transmitted through the frequencyband of the terminal-specific PUSCH assigned via the PDCCH data.

For example, the terminal may obtain information on the frequency bandassigned with the terminal-specific PUSCH 790 in the n+4^(th) subframe740 through the PDCCH data 765 of the nth subframe 770 transmittedthrough the downlink channel.

More specifically, the subframe where the uplink resource allocationinformation has been transmitted from the base station through thedownlink channel may be transmitted as the nth subframe 770. Thefrequency bandwidth allocation information of the terminal-specificPUSCH included in the control channel of the nth subframe 770 may beused in the n+4^(th) subframe 780 of the uplink channel.

In case the terminal-specific frequency band assigned with a PUSCHvaries, the terminal may change its operation frequency band to thevaried frequency band to send the terminal-specific PUSCH data. Asanother PUCCH data transmission method, a terminal-specific frequencyband may be determined for transmitting the PUCCH data irrespective ofthe terminal-specific frequency band assigned with the PUSCH. Forexample, the terminal may send the PUCCH data through a fixedterminal-specific frequency band.

FIG. 8 is a concept view illustrating an RB (resource block) to which aterminal-specific PUCCH is assigned according to an embodiment of thepresent invention.

FIG. 8 illustrates a method for indexing and sending a resource assignedwith a terminal-specific PUCCH in units of RB.

Referring to FIG. 8(A), the base station may inform the terminal ofindex information of the first RB among the resources of theterminal-specific PUCCH 800 assigned to the terminal. The terminal maysend terminal-specific PUCCH data through the assigned terminal-specificPUCCH 800 based on the received index information.

Referring to FIG. 8(B), the base station may additionally sendinformation on the indexes of the RBs starting to send an ACK/NACK andCSI among the resources of the terminal-specific PUCCHs 820 and 840. Inother words, the base station may send specific resource allocationinformation on the specific information included in theterminal-specific PUCCH data as well as the index information of the RBassigned with the terminal-specific PUCCH.

Further, according to another embodiment of the present invention,information on the center frequency of the frequency band assigned asthe terminal-specific PUCCH resource may be transmitted to the terminalto assign the resource of the terminal-specific PUCCH.

Hereinafter, a method for assigning the above-describedterminal-specific PUSCH and terminal-specific PUCCH is describedaccording to an embodiment of the present invention.

FIGS. 9 and 10 are concept views illustrating a method for assigning aterminal-specific PUSCH and a terminal-specific PUCCH according to anembodiment of the present invention.

FIGS. 9 and 10 illustrate a method for assigning the terminal-specificPUCCH and the terminal-specific PUSCH to the same or differentterminal-specific frequency bands.

As described above, an uplink frequency band may include a plurality ofterminal-specific frequency bands. One terminal-specific frequency bandmay include a terminal-specific PUSCH and a terminal-specific PUCCH.

In other words, the terminal may be assigned with the terminal-specificPUSCH data and the terminal-specific PUCCH data in the sameterminal-specific frequency band.

Referring to FIG. 9(A), in case the terminal specifies aterminal-specific frequency band through upper layer signaling (RRCsignaling) or DCI, the terminal may send the terminal-specific PUSCHinformation and the terminal-specific PUCCH information using theterminal-specific PUSCH 900 and the terminal-specific PUCCHs 920 and 940of the specified terminal-specific frequency band.

In case the position of the resource assigned to the terminal-specificPUSCH 900 is statically or semi-statically configured, theterminal-specific PUCCHs 920 and 940 may be assigned in the sameterminal-specific frequency band as the position of theterminal-specific PUSCH 900.

As another example, referring to FIG. 9(B), the frequency band assignedwith the terminal-specific PUSCHs 950, 960, 970, and 980 may befrequency-hopped according to a predetermined pattern. In such case, theresources of the terminal-specific PUCCHs 950-1, 950-2, 960-1, 960-2,970-1, 970-2, 980-1, and 980-2 included in the same terminal-specificfrequency band as the frequency band of the frequency-hoppedterminal-specific PUSCHs 950, 960, 970, and 980 may be assigned as PUCCHresources by the terminal.

As still another resource allocation method, the allocation informationon the terminal-specific PUCCH resource may be independently determined.

The terminal-specific PUSCH resource may be dynamically assigned byupper layer signaling or DCI. In such case, the overhead of changing theposition of the terminal-specific PUCCH resource according to theallocation information on the terminal-specific PUSCH needs to bereduced. Accordingly, the terminal-specific PUCCH and theterminal-specific PUSCH may be assigned to different terminal-specificfrequency bands from each other.

FIG. 10 shows an example method for separately transmitting allocationinformation on terminal-specific PUCCHs.

For example, the terminal may determine allocation of terminal-specificPUSCHs based on the DCI received through a downlink channel. It may beassumed that the allocation information on the terminal-specific PUSCHchanges from a first terminal-specific frequency band 1000 through asecond terminal-specific frequency band 1020 and a thirdterminal-specific frequency band 1020 back to the firstterminal-specific frequency band 1030, according to subframes.

The terminal-specific PUCCHs 1040 and 1050, without changing accordingto the terminal-specific frequency band assigned with theterminal-specific PUSCH, may be assigned separately by receiving theallocation information on the terminal-specific PUCCHs through upperlayer signaling (e.g., RRC signaling) or DCI.

The terminal-specific PUCCHs 1040 and 1050 may be assigned in the firstterminal-specific frequency band through RRC signaling and theterminal-specific PUCCH data may be sent in the assigned frequency band.

In other words, the resource allocation method according to anembodiment of the present invention may independently assign theterminal-specific PUCCHs 1000, 1010, 1020, and 1030 and theterminal-specific PUCCHs 1040 and 1050 independently from each other.

The terminal may send an SRS (sounding reference signal) as well as theterminal-specific PUSCH data and terminal-specific PUCCH data throughthe terminal-specific frequency band.

The SRS is a reference signal transmitted from the terminal so that thebase station may estimate the channel state information on theterminal's uplink channel. The SRS may be used for the base station toassign resources of good channel quality to the terminal. Further, theSRS may be used for performing link adaptation and power control betweenthe terminal and the base station. Upon transmission of the SRS, suchtransmission may be limited so that the SRS is transmitted only in theterminal-specific frequency band. The SRS transmitted only in theterminal-specific frequency band is defined and used as aterminal-specific SRS.

FIG. 11 is a concept view illustrating a method for transmitting aterminal-specific SRS according to an embodiment of the presentinvention.

Referring to FIG. 11, after performing random access, the specificterminal may sequentially send the SRS 1100 on all the terminal-specificfrequency bands. After the terminal has performed the random access, theterminal's SRS transmission may be limited to a terminal-specific band.The base station may assign a terminal-specific frequency band to beused by the terminal using the channel state information produced basedon the SRS 1100.

In other words, the terminal may sequentially send the SRS 1100 on theterminal-specific frequency band indexed from 1 to N−1 used as theterminal-specific frequency band. The base station may predict thechannel state information of the uplink channel based on the SRS 1100received from the terminal. At least one of the plurality ofterminal-specific frequency bands may be determined as the terminal'sterminal-specific frequency band based on the channel state informationof the uplink channel.

In sequentially sending the SRS 1100 in the terminal-specific frequencyband, a portion of the terminal-specific frequency band, but not theentire terminal-specific frequency band, may be specified so that theSRS 1100 may be sent only in the specified portion. For example, the SRS1100 may be included only in some RBs corresponding to the centerfrequency of the terminal-specific frequency band, and the SRS 1100 maybe transmitted. The terminal may send the SRS only in theterminal-specific frequency band. If the terminal is configured to sendthe SRs in a band outside the terminal-specific frequency band, theterminal might not send the SRS. Further, also in case the terminal isconfigured to send the SRS in two terminal-specific frequency bands, theterminal might not send the SRS. As another method, in case the terminalis configured so that the SRS transmission is performed through aplurality of bands, the terminal may send the SRS only in theterminal-specific frequency band in which the terminal operates.

As another method for sending the SRS 1100, in case the transmission ofthe SRS 1100 is limited to the terminal-specific frequency band, the SRS1100 might not be limited as transmitted in the last OFDM symbol of thesubframe.

FIG. 12 shows an example where the position of the OFDM symbol where theSRS is transmitted in the terminal-specific frequency band is changedaccording to an embodiment of the present invention.

In case the terminal-specific frequency band assigned to the terminalchanges, the terminal may perform frequency tuning for changing theterminal-specific frequency band. A delay may occur when the terminalperforms the frequency tuning. For example, in case theterminal-specific frequency band assigned to the terminal changes, adelay may take place in the period 1210 corresponding to n (n is anatural number) OFDM symbols from the first OFDM symbol among the OFDMsymbols on the time axis in the terminal-specific frequency band wherethe terminal shifted. As another example, the period 1220 correspondingto the last n OFDM symbols on the time axis in the terminal-specificfrequency band before the terminal shifts may be a delayed period.

In case a frequency tuning delay occurs, if the SRS is transmitted inthe last OFDM symbol, the SRS might not be sent to the base station.Accordingly, the position of the OFDM symbol where the SRS istransmitted may be newly set. For example, the SRS 1200 may beconfigured to be sent in the OFDM symbol used right before the OFDMsymbol that is not used for the reason of frequency tuning or the SRS1250 may be configured to be sent in the OFDM symbol other than the OFDMsymbol that is not used for the reason of frequency tuning.

The following two types of upper layer signaling may be used toconfigure information on the OFDM symbol where the SRS is transmitted.For example, the upper layer signaling may enable transmission of (10information on the OFDM symbol available by the terminal among the OFDMsymbols of the subframe transmitted through the uplink channel(information on the first OFDM symbol and the last OFDM symbol) and (2)information on the OFDM symbol where the SRS is transmitted. (1) and (2)are now described in detail.

(1) Information on the OFDM Symbol of the UL Sub-Frame Used by theTerminal for Transmission of Information

In case the terminal-specific frequency band used by the terminalchanges, a delay for frequency tuning may occur in a predeterminedtransient period where the terminal-specific frequency band changes.Considering such frequency tuning delay, information on the OFDM symbolof the subframe used by the terminal for actual transmission ofinformation may be transmitted to the terminal through upper layersignaling. The terminal may be aware of the information on the OFDMsymbol used for actual transmission of data in the terminal-specificfrequency band through the upper layer signaling.

Use of such method may avoid damage to the subsequent terminal'stransmission, which may occur when the terminal fails to satisfy therequirement on the transient period that occurs upon transmission on/offbetween the subframes. Further, a half-duplex terminal may be avoidedfrom the need to configure a gap for a delay used for switching fromdownlink (DL) to uplink (UL).

(2) Information on the Symbol Index where SRS is Transmitted

Information indicating a specific OFDM symbol where the SRS istransmitted may also be transmitted through upper layer signaling.Unless there is a limitation that the SRS should be transmitted in thelast OFDM symbol of the subframe, the SRS may be transmitted in aspecific OFDM symbol among the OFDM symbols of the subframe, andinformation on the OFDM symbol where the SRS is transmitted may betransmitted by upper layer signaling. As described above in connectionwith (2)(D), allocation for the terminal-specific PUSCH may bedetermined by upper layer signaling, and in such case, the base stationmay obtain the channel state information through the SRS transmittedfrom the terminal in order to determine the terminal-specific frequencyband assigned with the terminal-specific PUSCH.

In case the terminal-specific frequency band changes in one subframe orbetween contiguous subframes when performing uplink transmission,various methods may be used to conduct uplink transmission on PUSCHdata, PUCCH data, and SRS. Hereinafter, a method for transmitting PUSCHdata, PUCCH data, and SRS through one subframe or a plurality ofsubframes by the terminal is described below, according to an embodimentof the present invention.

FIGS. 13 and 14 are concept views illustrating a method for sending aPUSCH and an SRS in one subframe according to an embodiment of thepresent invention. FIG. 13(A) illustrates an example where theterminal-specific frequency band used for the terminal to send an SRS isset to be different from the terminal-specific frequency band assignedwith the terminal-specific PUSCH.

The terminal needs to change the existing terminal-specific frequencyband assigned with the terminal-specific PUSCH in order to send the SRS1300 in the specific OFDM symbol. TO change the operation frequencyband, the terminal needs frequency tuning, resultantly causing waste ofresources. To address such problem, the terminal, when needingtransmission tuning to send the SRS 1300, does not change theterminal-specific frequency band to send the SRS nor does the terminalsend the SRS 1300 in the corresponding symbol. The terminal may assignthe symbol 1330 assigned to send the SRS 1300 to the terminal-specificPUSCH using the existing terminal-specific frequency band.

FIG. 13(B) illustrates an example where the terminal-specific frequencyband used for the terminal to send the SRS 1350 is set to be differentfrom the terminal-specific frequency band assigned with theterminal-specific PUSCH.

FIG. 13(B) illustrates a method for transmitting the SRS 1350 throughthe first terminal-specific frequency band and the PUSCH information1360 through the second terminal-specific frequency band. In such case,the terminal-specific frequency bands used for the terminal to send theterminal-specific PUSCH information 1360 and the SRS 1350 in onesubframe are different from each other. In case the terminal-specificfrequency band varies, the time period 1370 corresponding to apredetermined OFDM symbol may be set as a period for frequency tuning.The terminal-specific PUSCH may be assigned for the remaining OFDMsymbols other than the period 1370 caused by the frequency tuning delay,and the terminal-specific PUSCH data 1360 may be transmitted with ratematching performed considering the frequency tuning delay.

The delay period for frequency tuning may be smaller than one OFDMsymbol.

FIG. 14(A) illustrates an example in which the delay period 1410 forfrequency tuning is smaller than one OFDM symbol 1420. In such case, thedelay period 1410 may be considered for frequency tuning in the OFDMsymbol period 1420 during which the SRS 1400 is transmitted, and theterminal-specific PUSCH data 1430 may be transmitted through theremaining subframe OFDM symbols.

FIG. 14(B) illustrates an example in which the terminal-specificfrequency band where the SRS 1450 is transmitted and theterminal-specific frequency band assigned with the terminal-specificPUSCH 1470 have an inclusion relation. In other words, theterminal-specific frequency band where the SRS is transmitted may beincluded in the terminal-specific frequency band for PUSCH or viceversa. In general, the size of the band assigned for theterminal-specific PUSCH may be larger than the size of the band for SRStransmission.

Since the terminal-specific frequency band where the SRS 1450 is thesame as the terminal-specific frequency band assigned with theterminal-specific PUSCH 1470, no frequency tuning is required. The datatransmitted through the terminal-specific PUSCH 1470 may be transmitteddata-matched, considering the OFDM symbol period during which the SRS1450 is transmitted.

Considering that the terminal-specific PUCCH is assigned and the SRS istransmitted in one subframe, the resource assigned for transmission ofthe terminal-specific PUCCH differs from the resource assigned for SRStransmission. Accordingly, the terminal-specific PUCCH and the SRS arenot assigned to the same OFDM symbol. In such case, the SRS is nottransmitted.

FIGS. 15 and 16 are concept views illustrating a method for assigning anSRS and a terminal-specific PUSCH in a plurality of subframes accordingto an embodiment of the present invention.

FIG. 15(A) illustrates an example in which the terminal-specificfrequency bandwidth in which the SRS 1520 and the terminal-specificPUSCH data 1540 are transmitted in the first subframe 1500 and thesecond subframe 1510 varies.

The SRS 1520 may be transmitted in the last OFDM symbol of the firstsubframe 1500 through the first terminal-specific frequency band, andthe terminal-specific PUSCH data 1540 of the second subframe 1510 may betransmitted through the second terminal-specific frequency band. In suchcase, the terminal-specific PUSCH data 1540 might not be transmittedduring a predetermined symbol period 1530 corresponding to the frequencytuning delay period among the OFDM symbols of the second subframe 1510.Accordingly, the terminal-specific PUSCH data 1540 may be transmittedwhich has undergone rate matching considering such frequency tuningdelay period.

FIG. 15(B) illustrates an example in which the terminal-specificfrequency bandwidth in which the SRS 1570 and the terminal-specificPUSCH data 1580 are transmitted between the first subframe 1550 and thesecond subframe 1560 varies.

In case frequency tuning for transmitting the terminal-specific PUSCHdata 1580 is performed in the next subframe after the SRS 1570 has beensent, the SRS 1570 might not be transmitted in the previous subframe toprevent a frequency tuning delay from occurring.

FIG. 16(A) illustrates an example in which the terminal-specificfrequency bandwidth in which the SRS 1620 and the terminal-specificPUSCH data 1640 are transmitted between the first subframe 1600 and thesecond subframe 1610 varies.

In FIG. 16(A), a portion of the last OFDM symbol period during which theSRS 1620 is transmitted in the first subframe 1600 may be used as thefrequency tuning delay period.

For example, in case the frequency tuning delay period is smaller thanone OFDM symbol, the last OFDM symbol may be used as period fortransmitting the SRS 1620 during only a predetermined period, and theremaining period 1630 may be used as frequency tuning delay period thatoccurs as the terminal changes its operation frequency band. The secondsubframe 1610, without using a separate frequency tuning delay period,may use the first OFDM symbol and its subsequent ones as resources fortransmitting the terminal-specific PUSCH data 1660.

FIG. 16(B) illustrates an example in which the terminal-specificfrequency band used for transmitting the SRS 1650 and theterminal-specific PUSCH data 1660 in a plurality of subframes does notvary. Since in such case no frequency tuning delay period occurs, theSRS 1650 and the terminal-specific PUSCH data 1660 may be transmitted inthe same terminal-specific frequency band.

FIG. 17 is a concept view illustrating a method for contiguouslyallocating terminal-specific PUSCHs in a plurality of subframesaccording to an embodiment of the present invention.

FIG. 17 illustrates a method for allocating the terminal-specific PUSCHthrough the first subframe in the first terminal-specific frequency bandand allocating the terminal-specific PUSCH through the second subframein the second terminal-specific frequency band. In case theterminal-specific frequency band varies between subframes, one of asymbol period including the last OFDM symbol of the first subframecorresponding to the previous subframe or a symbol period including thefirst OFDM symbol of the second subframe may be set as a frequencytuning delay period.

FIG. 17(A) is a concept view illustrating a method for configuring afrequency tuning delay in some symbol period including the last OFDMsymbol of the first subframe.

The symbol period 1720 including the last OFDM symbol of the firstsubframe 1700 may be a period 1720 for reflecting a frequency tuningdelay created in varying the operation frequency from the firstterminal-specific frequency to the second terminal-specific frequency.In such case, the symbol period for transmission of theterminal-specific PUSCH data transmitted in the first subframe 1700 maybe reduced, and rate matching may be conducted to reflect the same.

FIG. 17(B) is a concept view illustrating a method for configuring afrequency tuning delay in some symbol period 1750 including the firstOFDM symbol of the second subframe 1740.

The symbol period 1750 including the first OFDM symbol of the secondsubframe 1740 may be a period 1750 for reflecting the frequency tuningdelay created in varying the operation frequency from the firstterminal-specific frequency to the second terminal-specific frequency.In such case, the symbol period for transmission of theterminal-specific PUSCH data transmitted in the second subframe 1740 maybe reduced, and rate matching may be conducted to reflect the same.

FIG. 17(C) is a concept view illustrating an example in which the sameterminal-specific frequency band is used for allocatingterminal-specific PUSCHs between a plurality of subframes.

In case the same terminal-specific frequency bandwidth is used toallocate terminal-specific PUSCHs between the first subframe 1760 andthe second subframe 1770, no frequency tuning delay is required.Accordingly, the first subframe 1760 and the second subframe 1770 may betransmitted through the same terminal-specific frequency band. In casethe terminal-specific PUSCH data is contiguously scheduled, it may betransmitted in the same terminal-specific frequency band so that noterminal-specific frequency tuning delay occurs.

FIG. 18 is a concept view illustrating a method for contiguouslyallocating terminal-specific PUCCHs and terminal-specific PUSCHsaccording to an embodiment of the present invention.

FIG. 18 illustrates a method for allocating a terminal-specific PUCCHand a terminal-specific PUSCH in the first subframe and the secondsubframe.

Referring to FIG. 18(A), the terminal-specific PUCCHs 1820 and 1830 maybe assigned in the first subframe 1800 using the first terminal-specificfrequency, and the terminal-specific PUSCH 1850 may be assigned in thesecond subframe 1810 using the second terminal-specific frequency.

After the terminal-specific PUCCH data has been transmitted through thefirst terminal-specific frequency in the first subframe 1800, someperiod including the first OFDM symbol in the second subframe 1810 maybe used as a frequency tuning delay period. Accordingly, the remainingsymbols except the frequency tuning delay period 1840 in the secondsubframe 1810 may be used as symbols for transmitting theterminal-specific PUSCH data.

Referring to FIG. 18(B), the terminal-specific PUSCH data 1880 may betransmitted in the first subframe 1860 using the first terminal-specificfrequency, and the terminal-specific PUCCH data 1890 and 1895 may betransmitted in the second subframe 1870 using the secondterminal-specific frequency.

In case after the terminal-specific PUSCH data 1880 has been transmittedthrough the first terminal-specific frequency band in the first subframe1860, the terminal-specific PUCCH data 1890 and 1895 are transmitted inthe second subframe 1870 through the second terminal-specific frequencyband, some period including the last OFDM symbol in the first subframe1860 may be set and used as a frequency tuning delay period 1885. Insuch case, the remaining OFDM period except the frequency tuning delayperiod in the first subframe 1860 may be used for transmitting theterminal-specific PUSCH data 1880.

In other words, in case the terminal-specific PUSCH and theterminal-specific PUCCH are contiguously assigned in the sameterminal-specific frequency bandwidth, some OFDM symbol period of thesubframe assigned with the terminal-specific PUSCH may be set and usedas a frequency tuning delay period in order to transmit theterminal-specific PUCCH data without loss. The terminal-specific PUSCHdata may be transmitted in the OFDM symbol period except the frequencytuning period in the subframe assigned with the terminal-specific PUSCH,and in such case, the terminal-specific PUSCH data may be transmittedwith rate matching conducted to transmit the terminal-specific PUSCHdata.

FIG. 19 is a concept view illustrating a method for allocating an SRSand a terminal-specific PUCCH according to an embodiment of the presentinvention.

Referring to FIG. 19, in case the SRS 1920 is transmitted in the lastsymbol of the first subframe 1900 and the terminal-specific PUCCHs 1930and 1940 are assigned in the second subframe 1910, the SRS 1920 mightnot be sent in the last symbol of the first subframe 1900. The periodduring which the SRS 1920 is transmitted may be assigned as a frequencytuning delay period and frequency tuning may be conducted.

FIG. 20 is a block diagram illustrating a wireless communication systemaccording to an embodiment of the present invention.

Referring to FIG. 20, the base station 2000 includes a processor 2010, amemory 2020, and an RF (Radio Frequency) unit 2030. The memory 2020 isconnected with the processor 2010 and stores various types ofinformation for driving the processor 2010. The RF unit 2030 isconnected with the processor 2010 and transmits and/or receives radiosignals. The processor 2010 implements functions, procedures, and/ormethods as proposed herein. In the above-described embodiments, theoperation of the base station may be implemented by the processor 2010.

For example, the processor 2010 may be implemented to send to theterminal information on a terminal-specific frequency band used for theterminal to send uplink channel data.

The wireless device 2050 includes a processor 2060, a memory 2070, andan RF unit 2080. The memory 2070 is connected with the processor 2060and stores various types of information to drive the processor 2060. TheRF unit 2080 is connected with the processor 2060 and transmits and/orreceives radio signals. The processor 2060 implements functions,processes, and/or methods as proposed herein. In the above-describedembodiments, the operation of the wireless device may be implemented bythe processor 2060.

For example, the processor 2060 may be implemented to send to the basestation uplink channel data based on the uplink channel allocationinformation transmitted from the base station.

The processor may include an ASIC (application-specific integratedcircuit), other chipsets, a logic circuit, and/or a data processingdevice. The memory may include an ROM (read-only memory), an RAM (randomaccess memory), a flash memory, a memory card, a storage medium, and/orother storage devices. The RF unit may include a baseband circuit forprocessing radio signals. When an embodiment is implemented in software,the above-described schemes may be realized in modules (processes, orfunctions) for performing the above-described functions. The modules maybe stored in the memory and executed by the processor. The memory may bepositioned in or outside the processor and may be connected with theprocessor via various well-known means.

Although in the above-described exemplary embodiments, methods aredescribed based on flowcharts having a series of steps or blocks, thepresent invention is not limited to the order of the steps, and somesteps may be conducted in a different order from other steps orsimultaneously with the other steps. Further, it may be understood byone of ordinary skill in the art that the steps in the flowcharts do notexclude each other, and rather, other steps may be added thereto or somethereof may be removed therefrom without affecting the scope of thepresent invention.

What is claimed is:
 1. A method for An uplink transmission of an MTC (Machine Type Communication) terminal, the method comprising: transmitting first UL (uplink) information on a first UL channel in a first terminal-specific frequency band of a first OFDM (Orthogonal Frequency Division Multiplexing) symbol; and transmitting second UL information on a second UL channel in a second terminal-specific frequency band of a second OFDM symbol, wherein at least one OFDM symbol is arranged between the first OFDM symbol and the second OFDM symbol, and wherein when the first terminal-specific frequency band is not consistent with the second terminal-specific frequency band or when the first terminal-specific frequency band does not include the second terminal-specific frequency band, UL transmission is not performed in the at least one OFDM symbol between the first OFDM symbol and the second OFDM symbol.
 2. The method of claim 1, wherein the first OFDM symbol is a last OFDM symbol of a first subframe, and the second OFDM symbol is a second OFDM symbol of a second subframe contiguous to the first subframe, wherein a bandwidth supported by the MTC terminal is smaller than an overall bandwidth of the first subframe and the second subframe, wherein the size of the first terminal-specific frequency band and the second terminal-specific frequency band is equal to or smaller than the bandwidth supported by the MTC terminal, and wherein the overall bandwidth is 20 MHz or more, and the bandwidth supported by the MTC terminal is 0.5 MH or more and 2 MHz or less.
 3. The method of claim 1, wherein the first OFDM symbol is a last OFDM symbol of a first subframe, and the second OFDM symbol is a second OFDM symbol of a second subframe contiguous to the first subframe, and the method further comprising transmitting an SRS (Sounding Reference Signal) in a third terminal-specific frequency band of one OFDM symbol among a plurality of OFDM symbols in the first subframe.
 4. The method of claim 3, wherein the UL transmission is not performed in an OFDM symbol subsequent to the OFDM symbol where the SRS is transmitted.
 5. The method of claim 1, wherein the first UL channel includes at least one of a first PUCCH (physical uplink control channel) and a first PUSCH (physical uplink shared channel), and wherein the second UL channel includes at least one of a second PUCCH and a second PUSCH.
 6. The method of claim 1, further comprising: receiving terminal-specific frequency band determination information from a base station, wherein the terminal-specific frequency band determination information includes information on the first terminal-specific frequency band and the second terminal-specific frequency band.
 7. The method of claim 6, wherein the terminal-specific frequency band determination information includes information on a frequency pattern in which a frequency band changes from the first terminal-specific frequency band to the second terminal-specific frequency band. 